Figured out that one can lookup the source text of an enum value by accessing the _map property. This is a hack though, what is the preferred way to do it?

enum MyEnum {

A,

B

}

var x = MyEnum.B; // x == 1

var src = MyEnum['_map'][x]; // src == "B"

You got it.  The _map field gives you a way to get back to the names of the enums.

Potentially.  In a sense, it's more of a convenience which matches closely to how you'd do it in JS.  That said, you could try submitting a feature request and see if there's enough support for people who want to print out enums more cleanly.